No, you're wrong. This can and this will backfire. You share, for example, high res vector art that you designed, with your blog visitors. I, a potential abuser, come along and download your link multiple times (probably via multiple IPs/accounts, etc) and your daily bandwidth allowance of 30GB is gone. The general public can no longer download your vector art, and your guests won't go through the pain of setting up an account and getting themselves added to your contact list, etc. It'll work when you have smaller groups collaborating. But not if you're looking to target en-masse.

The new system is open to abuse.

"Its good it will prevent leech people blah blah" - at least try and understand the new system before you type in comments that make you look like an idiot.